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https://koyo.finance/
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Contract Source Code Verified (Exact Match)
Contract Name:
Vyper_contract
Compiler Version
vyper:0.3.3
Contract Source Code (Vyper language format)
# @version 0.3.3
"""
@title Kōyō Finance (KYO) token
@author Kōyō Finance
@license MIT
@dev 6_149_520_000 tokens are minter over the period of ~5 years (157680000 seconds).
Every epoch (1 second), 39 KYO tokens are available to be minted by the "Minter" contract.
"""
from vyper.interfaces import ERC20
implements: ERC20
event Transfer:
_from: indexed(address)
_to: indexed(address)
_value: uint256
event Approval:
_owner: indexed(address)
_spender: indexed(address)
_value: uint256
event Mint:
minter: indexed(address)
recipient: indexed(address)
amount: uint256
previous_total_supply: uint256
new_total_supply: uint256
event CommitOwnership:
owner: indexed(address)
event ApplyOwnership:
owner: indexed(address)
event SetMinter:
minter: indexed(address)
YEAR: constant(uint256) = 365 * 86400
EMISSION_DURATION: constant(uint256) = 5 * YEAR
EMISSION_AMOUNT: constant(uint256) = 6_149_520_000
name: public(String[64])
symbol: public(String[32])
decimals: public(uint256)
total_supply: uint256
balanceOf: public(HashMap[address, uint256])
allowances: HashMap[address, HashMap[address, uint256]]
emission_end: public(uint256)
emission_rate: public(uint256)
emissions_generated: public(uint256)
emissions_last_update_time: public(uint256)
owner: public(address) # Can and will be a smart contract
future_owner: public(address)
minter: public(address) # Can and will be a smart contract
future_minter: public(address)
@external
def __init__(_name: String[64], _symbol: String[32], _decimals: uint256):
"""
@notice Contract constructor.
@param _name Token full name.
@param _symbol Token symbol.
@param _decimals Number of decimals for token.
"""
ts: uint256 = block.timestamp
self.owner = msg.sender
self.minter = msg.sender
self.name = _name
self.symbol = _symbol
self.decimals = _decimals
self.emission_end = ts + EMISSION_DURATION
self.emission_rate = (EMISSION_AMOUNT * 10 ** _decimals) / EMISSION_DURATION
self.emissions_generated = 0
self.emissions_last_update_time = ts
@internal
@view
def assert_is_owner(addr: address):
"""
@notice Check if the call is from the owner, revert if not.
@param addr Address to be checked.
"""
assert addr == self.owner # dev: owner only
@internal
@view
def assert_is_minter(addr: address):
"""
@notice Check if the call is from the designated minter, revert if not.
@param addr Address to be checked.
"""
assert addr == self.minter # dev: minter only
@internal
def _update_emissions() -> uint256:
total: uint256 = self.emissions_generated
last_time: uint256 = min(block.timestamp, self.emission_end)
total += (last_time - self.emissions_last_update_time) * self.emission_rate
self.emissions_generated = total
self.emissions_last_update_time = last_time
return total
@external
@view
def totalSupply() -> uint256:
"""
@notice Total number of tokens in existence.
"""
return self.total_supply
@external
@view
def allowance(_owner : address, _spender : address) -> uint256:
"""
@notice Check the amount of tokens that an owner allowed to a spender.
@param _owner The address which owns the funds.
@param _spender The address which will spend the funds.
@return uint256 specifying the amount of tokens still available for the spender.
"""
return self.allowances[_owner][_spender]
@external
def transfer(_to : address, _value : uint256) -> bool:
"""
@notice Transfer `_value` tokens from `msg.sender` to `_to`.
@dev Vyper does not allow underflows, so the subtraction in
this function will revert on an insufficient balance.
@param _to The address to transfer to.
@param _value The amount to be transferred.
@return bool success.
"""
assert _to != ZERO_ADDRESS # dev: transfers to 0x0 are not allowed
self.balanceOf[msg.sender] -= _value
self.balanceOf[_to] += _value
log Transfer(msg.sender, _to, _value)
return True
@external
def transferFrom(_from : address, _to : address, _value : uint256) -> bool:
"""
@notice Transfer `_value` tokens from `_from` to `_to`.
@param _from address The address which you want to send tokens from.
@param _to address The address which you want to transfer to.
@param _value uint256 the amount of tokens to be transferred.
@return bool success.
"""
assert _to != ZERO_ADDRESS # dev: transfers to 0x0 are not allowed
# NOTE: vyper does not allow underflows
# so the following subtraction would revert on insufficient balance
self.balanceOf[_from] -= _value
self.balanceOf[_to] += _value
self.allowances[_from][msg.sender] -= _value
log Transfer(_from, _to, _value)
return True
@external
def approve(_spender : address, _value : uint256) -> bool:
"""
@notice Approve `_spender` to transfer `_value` tokens on behalf of `msg.sender`.
@dev Approval may only be from zero -> nonzero or from nonzero -> zero in order
to mitigate the potential race condition described here:
https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 .
@param _spender The address which will spend the funds.
@param _value The amount of tokens to be spent.
@return bool success.
"""
assert _value == 0 or self.allowances[msg.sender][_spender] == 0
self.allowances[msg.sender][_spender] = _value
log Approval(msg.sender, _spender, _value)
return True
@external
def increaseAllowance(_spender: address, _added_value: uint256) -> bool:
"""
@notice Increase the allowance granted to `_spender` by the caller
@dev This is alternative to {approve} that can be used as a mitigation for
the potential race condition
@param _spender The address which will transfer the funds
@param _added_value The amount of to increase the allowance
@return bool success
"""
allowance: uint256 = self.allowances[msg.sender][_spender] + _added_value
self.allowances[msg.sender][_spender] = allowance
log Approval(msg.sender, _spender, allowance)
return True
@external
def decreaseAllowance(_spender: address, _subtracted_value: uint256) -> bool:
"""
@notice Decrease the allowance granted to `_spender` by the caller.
@dev This is alternative to {approve} that can be used as a mitigation for
the potential race condition.
@param _spender The address which will transfer the funds.
@param _subtracted_value The amount of to decrease the allowance.
@return bool success.
"""
allowance: uint256 = self.allowances[msg.sender][_spender] - _subtracted_value
self.allowances[msg.sender][_spender] = allowance
log Approval(msg.sender, _spender, allowance)
return True
@external
def mint_available(_to: address) -> bool:
"""
@notice Mints any available tokens to `_to`.
@param _to Address to which all available tokens should be minted.
@return bool success.
"""
self.assert_is_minter(msg.sender)
assert _to != ZERO_ADDRESS # dev: zero address
amount_till: uint256 = self.emissions_generated
amount_overall: uint256 = self._update_emissions()
amount: uint256 = amount_overall - amount_till
_total_supply: uint256 = self.total_supply
self.total_supply = _total_supply + amount
self.balanceOf[_to] += amount
log Transfer(ZERO_ADDRESS, _to, amount)
log Mint(msg.sender, _to, amount, _total_supply, self.total_supply)
return True
@external
def burn(_value: uint256) -> bool:
"""
@notice Burn `_value` tokens belonging to `msg.sender`.
@dev Emits a Transfer event with a destination of 0x00.
@param _value The amount that will be burned.
@return bool success.
"""
self.balanceOf[msg.sender] -= _value
self.total_supply -= _value
log Transfer(msg.sender, ZERO_ADDRESS, _value)
return True
@external
def set_minter(_minter: address):
"""
@notice Set the minter address.
@param _minter Address of the minter.
"""
self.assert_is_owner(msg.sender)
self.minter = _minter
log SetMinter(_minter)
@external
def commit_transfer_ownership(addr: address):
"""
@notice Transfer ownership of the "Minter" contract to `addr`.
@param addr Address to have ownership transferred to.
"""
self.assert_is_owner(msg.sender)
self.future_owner = addr
log CommitOwnership(addr)
@external
def apply_transfer_ownership():
"""
@notice Apply ownership transfer.
"""
self.assert_is_owner(msg.sender)
_owner: address = self.future_owner
assert _owner != ZERO_ADDRESS # dev: owner not set
self.owner = _owner
self.future_owner = ZERO_ADDRESS
log ApplyOwnership(_owner)
@external
def set_name(_name: String[64], _symbol: String[32]):
"""
@notice Change the token name and symbol to `_name` and `_symbol`.
@dev Only callable by the admin account.
@param _name New token name.
@param _symbol New token symbol.
"""
self.assert_is_owner(msg.sender)
self.name = _name
self.symbol = _symbolContract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"name":"Transfer","inputs":[{"name":"_from","type":"address","indexed":true},{"name":"_to","type":"address","indexed":true},{"name":"_value","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"Approval","inputs":[{"name":"_owner","type":"address","indexed":true},{"name":"_spender","type":"address","indexed":true},{"name":"_value","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"Mint","inputs":[{"name":"minter","type":"address","indexed":true},{"name":"recipient","type":"address","indexed":true},{"name":"amount","type":"uint256","indexed":false},{"name":"previous_total_supply","type":"uint256","indexed":false},{"name":"new_total_supply","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"CommitOwnership","inputs":[{"name":"owner","type":"address","indexed":true}],"anonymous":false,"type":"event"},{"name":"ApplyOwnership","inputs":[{"name":"owner","type":"address","indexed":true}],"anonymous":false,"type":"event"},{"name":"SetMinter","inputs":[{"name":"minter","type":"address","indexed":true}],"anonymous":false,"type":"event"},{"stateMutability":"nonpayable","type":"constructor","inputs":[{"name":"_name","type":"string"},{"name":"_symbol","type":"string"},{"name":"_decimals","type":"uint256"}],"outputs":[]},{"stateMutability":"view","type":"function","name":"totalSupply","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"allowance","inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"nonpayable","type":"function","name":"transfer","inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"transferFrom","inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"approve","inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"increaseAllowance","inputs":[{"name":"_spender","type":"address"},{"name":"_added_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"decreaseAllowance","inputs":[{"name":"_spender","type":"address"},{"name":"_subtracted_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"mint_available","inputs":[{"name":"_to","type":"address"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"burn","inputs":[{"name":"_value","type":"uint256"}],"outputs":[{"name":"","type":"bool"}]},{"stateMutability":"nonpayable","type":"function","name":"set_minter","inputs":[{"name":"_minter","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"commit_transfer_ownership","inputs":[{"name":"addr","type":"address"}],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"apply_transfer_ownership","inputs":[],"outputs":[]},{"stateMutability":"nonpayable","type":"function","name":"set_name","inputs":[{"name":"_name","type":"string"},{"name":"_symbol","type":"string"}],"outputs":[]},{"stateMutability":"view","type":"function","name":"name","inputs":[],"outputs":[{"name":"","type":"string"}]},{"stateMutability":"view","type":"function","name":"symbol","inputs":[],"outputs":[{"name":"","type":"string"}]},{"stateMutability":"view","type":"function","name":"decimals","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"balanceOf","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"emission_end","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"emission_rate","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"emissions_generated","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"emissions_last_update_time","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"owner","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"future_owner","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"minter","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"future_minter","inputs":[],"outputs":[{"name":"","type":"address"}]}]Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000012000000000000000000000000000000000000000000000000000000000000000c4bc58d79c58d20546f6b656e000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034b594f0000000000000000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : _name (string): Kōyō Token
Arg [1] : _symbol (string): KYO
Arg [2] : _decimals (uint256): 18
-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [3] : 000000000000000000000000000000000000000000000000000000000000000c
Arg [4] : 4bc58d79c58d20546f6b656e0000000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [6] : 4b594f0000000000000000000000000000000000000000000000000000000000
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